Grain Drying Energy and Fuel
Water removed = weight x (Mi - Mf)/(100 - Mf), energy = water x ~1500 Btu/lb, propane = energy/91,500. 1000 bu corn (56 lb/bu) from 20% to 15% -> 3,294 lb water, 4.94 million Btu, 54 gal; drying only to 17.5% roughly halves both. The dryer efficiency and fuel heat content govern.
Formula and source
weight = bushels x lb/bu; water = weight x (Mi - Mf)/(100 - Mf); energy = water x Btu/lb; propane = energy / 91500.
Grain drying energy from the wet-basis shrink and a heat balance, standard grain-handling practice, by name.
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